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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Cash flows from operating activities: |  |  |
Net income | $ 58,711 | $ 82,770 | $ 66,130
Adjustments to reconcile net income to net cash provided by operating activities- |  |  |
Depreciation | 22,926 | 21,422 | 18,304
Amortization | 43,947 | 45,700 | 44,328
Amortization of original issue discount | 2,983 | 2,819 | 2,664
Asset impairment | 11,030 | 438 | 1,851
Gain on short-term investments and other | (123) | (364) | (101)
Loss on extinguishment of debt |  |  | 810
Deferred income taxes | (1,033) | (77) | 4,913
Stock-based compensation | 25,237 | 19,919 | 19,358
Changes in operating assets and liabilities, net of acquired amounts: |  |  |
Trade accounts receivable, net | 14,659 | (4,015) | (138)
Other current and non-current assets and liabilities | (10,688) | (17,727) | (23,179)
Income taxes payable/receivable | 5,405 | 4,771 | 5,055
Trade accounts payable and accrued liabilities | (5,752) | (10,317) | (7,146)
Deferred revenue | 5,718 | 5,737 | 10,492
Net cash provided by operating activities | 173,020 | 151,076 | 143,341
Cash flows from investing activities: |  |  |
Purchases of software, property and equipment | (29,397) | (37,319) | (57,104)
Purchases of short-term investments | (81,824) | (54,258) | (75,022)
Proceeds from sale/maturity of short-term investments | 56,454 | 52,135 | 190,778
Acquisition of and investments in business, net of cash acquired | (11,491) | (17,194) | (144,791)
Net cash used in investing activities | (66,258) | (56,636) | (86,139)
Cash flows from financing activities: |  |  |
Proceeds from issuance of common stock | 2,523 | 2,227 | 2,311
Payment of cash dividends | (31,056) | (29,126) | (27,979)
Repurchase of common stock | (38,123) | (30,918) | (34,726)
Exercise of common stock warrants |  | (12,911) |
Proceeds from long-term debt |  |  | 150,000
Payments on long-term debt | (10,313) | (7,500) | (125,625)
Payments of deferred financing costs |  |  | (1,490)
Net cash used in financing activities | (76,969) | (78,228) | (37,509)
Effect of exchange rate fluctuations on cash | 2,358 | 1,059 | (2,659)
Net increase in cash and cash equivalents | 32,151 | 17,271 | 17,034
Cash and cash equivalents, beginning of period | 156,548 | 139,277 | 122,243
Cash and cash equivalents, end of period | 188,699 | 156,548 | 139,277
Cash paid during the period for- |  |  |
Interest | 13,681 | 16,064 | 15,857
Income taxes | $ 22,431 | $ 18,358 | $ 10,426

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